I think you're arguing against a "straw man" here somewhat - I can't recall ever hearing the 9mm described as "feeble" here on TFL.

There may be sites on the internet where the "conventional wisdom" is that "If you're not packing at least a .45 ACP or a 10mm, you may as well just throw the gun at the bad guy rather than shooting him", but this isn't one of those places.